Improvement in key-hole guards



ndere EDMOND E. PARDsoN, or PROVIDENCE, RHODE ISLAND." Letters .Patent No. 87,714, dated Mtl/rch 9, 1869.

HEPRCVEMENT IN KEY-HOLE GUARDS.

The Schedule referred to in these Letters Patent and making part at the Same.

To all whom it ma/y conccm:

Beit known that I, EDMOND E. SHEPABDSQN, of the city and county of Providence, in theState of Rhode Island, have invented a new and useful Im? provement in KeyHole Protectors; and I do hereby declare that the following is a full, clear, and exact desciiption of the same, reference being had to the annexed drawings, making a part of this specification, in which l Figure lis a perspective view of my invention.

Figure 2 is a perspective view, showing the fastener turned as when in use in a key-hole.

Figures 3, 4, 5, and 6, are detailed parts.

In the accompanying drawing- 4A, lig. 1, is a tube, having a chamber, B, fastened to its side, and a guide, C, on the same line, extending nearly to the opposite end.

On the inside of chamber B, are three small wires and springs, as `shown in section, g. 5. These wires being separated, act independently of each other.

d, iig. 3, is a piece of wire, having a slot out lengthwise, with holes drilled in the slot, and nearly through. On the opposite end of d, is screwed an arm, e. This varm is fitted into guide C, ng. 1, and -used for the purpose of Asecuring or fastening the protector in a keyhole when in position, as'shown in lgs.2 and 5.

The thnee holes drilled in the slot on d, are used for holding three short pieces of wire, arranged the same distance apart as the three wires in chamber B, so they can be turned with d, to correspond with wires in chamber B, fig.' 5. 1 A

The three short wires arev of dierent length, with one end made convex on a line with the circumference of slotted wire d, and the ends of wires in chamber B, in direct proximity, are concave to match, as shown in iiig. 4 by the dotted circle.

By tting the ends of the wires in this manner, they are susceptible to the slightest change from the width of key intheiroperatio -A A portion of tube A is cut out, for the purpose of allowing the arm e to be operated or turned out of i guide O, figs. 2 and 5', according to the length of each A short wire. That part of the key which operates them, should be made wide enough to just ll the balance of diameter -f d, as represented in fig. 5. l

To use my invention, a door being fastened by any ordinary look, the key is removed, and my protector, as shown in fig. l, is'put into the vkey-hole, the same as acommon key. The arm c srthen turned into the lock. :The key of the protector is then drawn out. The springs in chamber B, acting ou. the wires, force them into the holes drilled in d, pressing the short wires into the spaces occupied by the key, g. 6, thus fastening the arm e, and securing the protector in the key-hole.

. The advantage is, that there is less liability of a lock being picked by duplicate or skeleton keys, as the protector must be removed first, making a double safeguard to a door. Y

I do not broadly claim a keyhole guard, combining Within itself a lock,'nor v.the pin-tumblers used therein; but

I claim as n'w,

y and desire to. secure by Letters Patent- The key-hole guard, consisting of the slotted wire d, arm e, tube A, and guide C, in combination with the convex .piu-tumblers in d, and concave piu-tumblers in B, when constructed and operating as herein de- 

